End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas
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End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas
Gerta Keller, Theirry Adatte
One of the liveliest, contentious, and long-running scientific debates began over three decades ago with the discovery of an iridium anomaly in a thin clay layer at Gubbio, Italy, that led to the hypothesis that a large impact caused the end-Cretaceous mass extinction. For many scientists the discovery of an impact crater near Chicxulub on Yucatan in 1991 all but sealed the impact-kill hypothesis as proven with the impact as sole cause for the mass extinction. Ever since that time evidence to the contrary has generally been interpreted as an impact-tsunami disbturbance. A multi-disciplinary team of reserachers has tested this assertion in new cores and a dozen outcrops along the Brazos River, Texas. In this area undisturbed sediments reveal a complete time stratigraphic sequence containing the primary impact spherule ejecta layer in late Maastrichtian claystones deposited about 200-300 thousand years before the mass extinction.
PDF ebook file size: 188 mb
ISBN 978-1-56576-308-1
eISBN 978-1-56576-309-8
Title information
CONTENTS
The Cretaceous–Tertiary Mass Extinction: Theories and Controversies
Gerta Keller
Defining the Cretaceous–Tertiary Boundary: A Practical Guide and Return to First Principles
Gerta Keller
Age and Origin of the Chicxulub Impact and Sandstone Complex, Brazos River, Texas: Evidence from Lithostratigraphy and Sedimentology
Thierry Adatte, Gerta Keller, and Gerald R. Baum
Biostratigraphy, Age of Chicxulub Impact, and Depositional Environment of the Brazos River KTB Sequences
Gerta Keller, Sigal Abramovich, Thierry Adatte, and Zsolt Berner
Maastrichtian Planktic Foraminiferal Biostratigraphy and Paleoenvironment of Brazos River, Falls County, Texas, U.S.A.
Sigal Abramovich, Gerta Keller, Zsolt Berner, Matan Cymbalista, and Carmi Rak
Calcareous Nannofossils Across the Cretaceous–Tertiary Boundary at Brazos, Texas, U.S.A.: Extinction and Survivorship, Biostratigraphy, and Paleoecology
Abdel Aziz Tantawy
The Distribution of Benthic Foraminifera Across the Cretaceous–Paleogene Boundary in Texas (Brazos River) and Denmark (Stevns Klint)
Malcolm B. Hart, Sarah R. Searle, Sean E. Feist, Andrew D. Leighton, Gregory D. Price, Christopher W. Smart, and Richard J. Twitchett
Cretaceous–Tertiary Mass Extinction in Marginal and Open Marine Environments: Texas, U.S.A. and Tunisia
Gerta Keller
Platinum Group Element (PGE) Geochemistry of Brazos Sections, Texas, U.S.A.
Brian Gertsch, Gerta Keller, Thierry Adatte, and Zsolt Berner
Trace-Element Geochemistry of Brazos Sections, Texas, U.S.A.
Brian Gertsch, Gerta Keller, Thierry Adatte, and David Bartels
The Sandstone Complex in the Brazos Riverbed Section: Geochemical Constraints on Genesis and Depositional Conditions
Dirk Munsel, Zsolt Berner, and Doris Stüben
Geochemistry of Chicxulub Impact Spherules in the Brazos River Section, Texas, U.S.A.
Patrick Ullman, Zsolt Berner, and Utz Kramar
PDF ebook file size: 188 mb